RCA-RP7954A-pr-sm 维修电路原理图.pdf

RP7954AFEB/99RP7954AAudio/CommunicationLatin America After Sales Indianapolis IN 46290 U.S.A.SERVICE DATA INDEXUSE ISOLATION TRANSFORMER WHEN SERVICINGSAFETY NOTICEComponents having special safety characteristics are identified by a ( ) on schematics and on the parts list in this Service Data and its bulletins.Before servicing this instrument, it is important that the service technician read and follow the Safety Precautions in the Basic Service Data.RP7954ABasic Service DataFirst Edition - First PrintingCopyright 1999 - Thomson Consumer Electronics, Inc.Printed in U.S.A. - Trademark(s)fi Registered - Marca(s) Registrada(s)PageNumberExploded View.1-6Replacement Parts .1-3Safety Precautions .1-2Schematic .1-7CAUTION: Modification or repair of this unit by unauthorized persons is a direct violation of FCC Rules Part 68.216 and couldresult in risk of electric shock. You are urged to contact a qualified factory authorized service facility for repairs.RadioFans.CN 收音机爱 好者资料库SAFETY PRECAUTIONS1. Before returning the instrument to the customer, always make asafety check of the entire instrument, including, but not limited to, thefollowing items:a. Be sure that no built-in protective devices are defective and/orhave been defeated during servicing. (1) Protective shields areprovided on this instrument to protect both the technician and thecustomer. Correctly replace all missing protective shields, includingany removed for servicing convenience. (2) When reassemblingthe instrument, be sure to put back in place all protective devices,including, but not limited to, nonmetallic control knobs, insulatingfishpapers, adjustment and compartment covers/shields, andisolation resistor/capacitor networks. Do not operate thisinstrument or permit it to be operated without all protectivedevices correctly installed and functioning. Servicers whodefeat safety features or fail to perform safety checks may beliable for any resulting damage, and may expose themselvesand others to possible injury.b. Be sure that there are no cabinet openings through which an adultor child might be able to insert their fingers and contact ahazardous voltage. Such openings include, but are not limited to,(1) excessively wide cabinet ventilation slots, and (2) improperlyfitted and/or incorrectly secured cabinet covers.c. Leakage Cold Check - With the instrument AC plug removedfrom any AC source, connect an electrical jumper across the twoAC plug prongs. Place the instrument AC switch in the onposition. Connect one lead of an ohmmeter to the AC plug prongstied together and touch the other ohmmeter lead in turn to eachpush button/customer control, exposed metal screws, metallizedoverlays and to each cable connector. If the measured resistanceis less than 1.0 megohm or greater than 5.2 megohm an abnormalityexists that must be corrected before the instrument is returned tothe customer. Repeat this test with the AC switch in the offposition.d. Leakage Current Hot CheckOn completely assembled instrument, plug the AC line corddirectly into a 120V AC outlet. (Do not use an isolation transformerduring this test.) Use a leakage current tester or a metering systemthat complies with American National Standards Institute (ANSI)C101.1 Leakage Current for Appliances and UnderwritersLaboratories (UL) 1492 (Section 67). Measure for current from aknown earth ground (metal waterpipe, conduit, etc.) to all exposedmetal or conductive parts of the instrument (antenna connections,handle bracket, metal cabinet, screwheads, metallic overlays,push-buttons, control shafts, etc.), especially any exposed metalparts that offer an electrical return path to the chassis. Any currentmeasured must not exceed 0.5 milliamp. Reverse the instrumentpower cord plug in the outlet and repeat the test.ANY MEASUREMENTS NOT WITHIN THE LIMITSSPECIFIED HEREIN INDICATE A POTENTIAL SHOCKHAZARD THAT MUST BE ELIMINATED BEFORERETURNING THE INSTRUMENT TO THE CUSTOMEROR BEFORE CONNECTING TO ANTENNA ORACCESSORIES.e. Interconnected Equipment AC Leakage TestAvoid shock hazards. The instrument, accessory, or cable(s) towhich this instrument is connected should have the applicablesections of the leakage resistance cold check and the leakagecurrent hot check performed. Do not connect this instrument to anantenna, cable or accessory that exhibits excessive leakage currents.2. Read and comply with all caution and safety-related notes on or insidethe instrument cabinet, and on the chassis.3. Design Alteration Warning - Do not alter or add to the mechanical orelectrical design of this instrument. Design alterations and additions,including, but not limited to, circuit modifications and the addition ofitems such as auxiliary audio output connections, cables and accessories,etc., might alter the safety characteristics of this instrument and createa hazard to the user. Any design alterations or additions will void themanufacturers warranty and will make you, the servicer responsiblefor personal injury or property damage resulting therefrom.4. Observe original lead dress. Take extra care to assure correct lead dressin the following areas: (a) near sharp edges, (b) near thermally hot parts- be sure that leads and components do not touch thermally hot parts,and (c) the AC supply. Always inspect in all areas for pinched, out-of-place, or frayed wiring. Do not change spacing between componentsand the printed-circuit board. Check AC power cord for damage.5. Components, parts and/or wiring that appear to have overheated or areotherwise damaged should be replaced with components, parts orwiring that meet original specifications. Additionally, determine thecause of overheating and/or damage and, if necessary, take correctiveaction to remove any potential safety hazard.6. PRODUCT SAFETY NOTICE - Many electrical and mechanicalparts have special safety-related characteristics, some of which areoften not evident from visual inspection, nor can the protection theygive be obtained by replacing them with components rated for highervoltage, wattage, etc. Parts that have special safety characteristics areidentified in this service data by a (|) on schematics and in the parts list.Use of a substitute replacement that does not have the same safetycharacteristics as the recommended replacement part in this servicedata parts list might create shock, fire and/or other hazards. ProductSafety is under review continuously and new instructions are issuedwhenever appropriate. For the latest information, always consult theappropriate current service literature.1-2RadioFans.CN 收音机爱 好者资料库RP7954A EXPLODED VIEWPage 1-6RP7954A EXPLODED VIEWBEFORE REPLACING PARTS, READ THE FOLLOWING:REPLACEMENT PARTSWarranty Status of Assemblies and Parts - All assemblies and components shown in this part list are eligible for warranty exchange or replacement except those with a dot shown to the left of the Description. Assemblies and components with a dot to the left of the Description are NOT eligible for warranty exchange or replacement.Warranty replacement of cabinet parts requires the approval of a Thomson Consumer Electronics Field Service Manager.Warranty Status and Specifications of assemblies and components are subject to change without notice. Consult the TCE Parts Pricing Microfiche for the latest warranty status information.Approved Substitute Stock Numbers - Before ordering stock numbers in the part list, look for an approved substitute stock number in the current Price Schedule. This will minimize your service time and avoid ordering parts you already have in stock.NOTE: When ordering components that are listed more than once in this part list, always adhere to the serial number application guidelines given in the description column. If a serial number application guideline is not given, always select the component with a value, rating, other specification or identification marking(s) that match those of the corresponding component in the instrument you are servicing.PRODUCT SAFETY NOTE: Components marked with a critical safety symbol have special characteristics important to safety. Before replacing any of these components, carefully read the PRODUCT SAFETY NOTICE in the basic service data. Do not degrade the safety of the set through improper servicing. Although assemblies as a whole may not be marked with a critical safety symbol , replacement of assemblies with other assemblies not approved may result in a safety hazard.1 - 3February 1999PartsListCritical Safety SymbolNot Eligible For WarrantyStockSymbolDescriptionDrawingSymbolStockDescriptionDrawingRP-7954ACABINET & CHASSIS16A29092LENS CASS DOOR A43-07954-0126A29093LENS CASS DOOR B43-07954-0239A29094COVER CASS DOOR A66-07954-0049A29095COVER CASS DOOR B66-07954-0156A29096LENS DISPLAY43-07954-00A62A29097HOLDER GEAR CASS DOOR63-10001-0172A29098GEAR DAMPER CASS DOOR63-10001-02898A29099CABINET FRONT60-07954-00A943A29100KNOB REPEAT53-07954-031043A29101KNOB POWER53-07954-0010273A29131MECHANISM CD TCM122.598-07936-0110662A29132MECHANISM CASS CS-21SW-62894-21628-001143A29102KNOB CD FUN53-07954-061122A29133PLATE LOGO40-13008-011243A29103KNOB STOP53-07954-041343A29104KNOB SUPER BASS53-07954-051543A29105KNOB VOL51-07954-001643A29106KNOB TUNING51-07954-011943A29107KNOB BAND 253-07954-022043A29108KNOB BAND 153-07954-01232A29109GEAR A47-00937-032743A29110BUTTON STOP/EJECT B53-07954-142843A29111BUTTON PLAY B53-07954-132943A29112BUTTON PAUSE A53-07954-073043A29113BUTTON STOP/EJECT A53-07954-083143A29114BUTTON FFWD A53-07954-093243A29115BUTTON REW A53-07954-103343A29116BUTTON PLAY A53-07954-113443A29117BUTTON REC A53-07954-12362A26916DISC55-07953-01372A26914HOLDER DISC48-00920-003843A29118KNOB CD DOOR OPEN53-07954-15396A29119LENS CD DOOR43-07953-09409A29120DOOR CD66-07953-06422A26795HOLDER DAMPER GEAR63-00206-00431A26921PIN CD DOOR EJECT55-07953-00442A26794GEAR DAMPER63-00206-01488A25151SOCKET AC POWER12-00004-094978A29121HANDLE57-07953-065098A29122CABINET REAR61-07953-20519A29123DOOR BATTERY SMALL58-07953-07529A29124DOOR BATTERY58-07953-06533A26958SPRING -74-01000-01A542A26959CONTACT PLATE +74-00910-00553A26960SPRING +/-74-01000-00A5882A26956ANTENNA WHIP23-00910-006066A31143CORD POWER30-00029-02L6188A29125TRANSFORMER POWER15-06610-006245A29126FOOT RUBBER81-07953-02753A29127SPRING CASS DOOR36-07954-00771A26807GROMMET RUBBER BLK81-07635-08822A29128MAGNET97-00255-02L842A26918PLATE CLAMPER39-07953-03853A29129SPRING CD KNOB EJECT36-07953-01A873A29130SPRING CD BUTTON EJECT36-03310-02893A26814SPRING CD DOOR36-07930-01991A26806RUBBER CD81-07635-071 - 3StockSymbolDescriptionDrawingSymbolStockDescriptionDrawing1 - 4REPLACEMENT PARTS(Continued)February 1999ELECTRICAL COMPONENTSCF136A15191FILTER09-50107-20D116A29139DIODE LED LT0311G-4102-30041-02GD10198589DIODE 1N414802-04148-00RD11198589DIODE 1N414802-04148-00RD12198589DIODE 1N414802-04148-00RD13198589DIODE 1N414802-04148-00RD14198589DIODE 1N414802-04148-00RD15198589DIODE 1N414802-04148-00RD16198589DIODE 1N414802-04148-00RD17198589DIODE 1N414802-04148-00RD18198589DIODE 1N414802-04148-00RD19198589DIODE 1N414802-04148-00RD2198589DIODE 1N414802-04148-00RD20198589DIODE 1N414802-04148-00RD21198589DIODE 1N414802-04148-00RD23198589DIODE 1N414802-04148-00RD24198589DIODE 1N414802-04148-00RD25198589DIODE 1N414802-04148-00RD26198589DIODE 1N414802-04148-00RD29198589DIODE 1N414802-04148-00RD3198589DIODE 1N414802-04148-00RD30198589DIODE 1N414802-04148-00RD30816A29139DIODE LED02-30041-02GD31198589DIODE 1N414802-04148-00RD32198589DIODE 1N414802-04148-00RD34198589DIODE 1N414802-04148-00RD35198589DIODE 1N414802-04148-00RD36198589DIODE 1N414802-04148-00RD37198589DIODE 1N414802-04148-00RD38198589DIODE 1N414802-04148-00RD4EA16X1078DIODE ZENER 9.1V 1/2W02-50091-00D5EA16X1078DIODE ZENER 9.1V 1/2W02-50091-00D501198597DIODE02-04001-00D502198597DIODE02-04001-00D503198597DIODE02-04001-00D504198597DIODE02-04001-00D6198589DIODE 1N414802-04148-00RD7198589DIODE 1N414802-04148-00RD8198589DIODE 1N414802-04148-00RD916A11218DIODE02-01043-00FIL36A25176FILTER CERAMIC CCFA-45509-00455-01TFIL36A27314FILTER FM09-80001-00TIC133A23328IC TA8227P03-08227-00IC333A14317IC TA8189A03-08189-00IC433A29140IC LA182803-01828-00JAC41A26978JACK PHONES12-21235-15LAB4A31110LABEL POPPOPRP7954LCD30163A29145DISPLAY LCD91-07954-00Q1015A29137TRANSISTOR 9014C01-09014-03AQ10115A26816TRANSISTOR 9013G01-09013-07Q10215A26816TRANSISTOR 9013G01-09013-07Q10315A20006TRANSISTOR 2SC3330U01-03330-21Q10515A29137TRANSISTOR 9014C01-09014-03AQ10615A29137TRANSISTOR 9014C01-09014-03AQ10715A29137TRANSISTOR 9014C01-09014-03AQ10815A29137TRANSISTOR 9014C01-09014-03AQ1115A29137TRANSISTOR 9014C01-09014-03AQ1215A29137TRANSISTOR 9014C01-09014-03AQ1315A15170TRANSISTOR01-09015-03Q16315A26973TRANSISTOR 8050D01-08050-04SQ1715A20006TRANSISTOR 2SC3330U01-03330-21Q1815A29134TRANSISTOR 2SA1317S01-01317-01Q1915A20006TRANSISTOR 2SC3330U01-03330-21Q2015A20006TRANSISTOR 2SC3330U01-03330-21Q20115A26816TRANSISTOR 9013G01-09013-07Q20215A26816TRANSISTOR 9013G01-09013-07Q20315A20006TRANSISTOR 2SC3330U01-03330-21Q20415A29137TRANSISTOR 9014C01-09014-03AQ20515A29137TRANSISTOR 9014C01-09014-03AQ20615A29137TRANSISTOR 9014C01-09014-03AQ20715A29137TRANSISTOR 9014C01-09014-03AQ20815A29137TRANSISTOR 9014C01-09014-03AQ2115A29137TRANSISTOR 9014C01-09014-03AQ2515A29137TRANSISTOR 9014C01-09014-03AQ2615A29136TRANSISTOR 8550D01-08550-04SQ715A29135TRANSISTOR 2SC1383R01-01383-18Q815A26815TRANSISTOR 2SD201201-02012-00Q915A29137TRANSISTOR 9014C01-09014-03ASOC8A25151SOCKET AC POWER12-00004-09SW139A29144SWITCH SLIDE16-10403-42SW239A29143SWITCH SLIDE16-10402-31SW30139A26820SWITCH TACT16-10102-03SSW30239A26820SWITCH TACT16-10102-03SSW30339A26820SWITCH TACT16-10102-03SSW30439A26820SWITCH TACT16-10102-03SSW30539A26820SWITCH TACT16-10102-03SSW30639A26820SWITCH TACT16-10102-03SSW30739A26820SWITCH TACT16-10102-03SSW30839A26820SWITCH TACT16-10102-03SSW30939A26820SWITCH TACT16-10102-03SSW31039A26820SWITCH TACT16-10102-03SSW31139A26820SWITCH TACT16-10102-03SSW31239A26820SWITCH TACT16-10102-03SSW31339A26820SWITCH TACT16-10102-03SSW31439A26820SWITCH TACT16-10102-03SSW31539A26820SWITCH TACT16-10102-03SSW31639A26820SWITCH TACT16-10102-03SSW31739A26820SWITCH TACT16-10102-03SSW31839A26820SWITCH TACT16-10102-03SSW31939A26820SWITCH TACT16-10102-03SSW32039A26820SWITCH TACT16-10102-03SSW32139A26820SWITCH TACT16-10102-03SSW32239A26820SWITCH TACT16-10102-03SSW32339A26820SWITCH TACT16-10102-03S1 - 4StockSymbolDescriptionDrawingSymbolStockDescriptionDrawing1 - 5REPLACEMENT PARTS(Continued)February 1999SW32439A26820SWITCH TACT16-10102-03SSW32539A26820SWITCH TACT16-10102-03SSW32639A26820SWITCH TACT16-10102-03SSW32739A26820SWITCH TACT16-10102-03SSW32839A26820SWITCH TACT16-10102-03SSW32939A26820SWITCH TACT16-10102-03SSW33039A26820SWITCH TACT16-10102-03SSWI39A29141SWITCH LEAF CD DOOR16-10101-26SWI39A29142SWITCH PUSH POWER16-10202-47TTER38A26977TERMINAL SPEAKER12-00006-00TRA88A29125TRANSFORMER POWER15-06610-00USEUCRP7954USE & CARE GUIDEUCRP79541 - 5RP7954A MAIN SCHEMATICPage 1-7RP7954A MAIN SCHEMATIC